condition mean min max ZT0-3 8.55 8.55 8.55 ZT4-7 20.6 20.6 20.6 ZT8-11 54.2 54.2 54.2 ZT12-15 28.25 28.25 28.25 ZT16-19 5.4 5.4 5.4 ZT20-23 12.0 12.0 12.0